Roared on under blue skies by the large gallery desperate for a home victor, the 39th-ranked Hall started the day a shot behind Pornanong, who led after the second and third rounds.
Georgia Hall of England reeled in long-time leader Pornanong Phatlum in a final-round duel at Royal Lytham to win the Women's British Open for her first major title on Sunday.
Although her father Wayne was on the bag at Royal Lytham, Hall's regular caddie is her boyfriend Harry Tyrrell, himself an aspiring professional.
4 HE named Georgia in honour of Sir Nick Faldo's Masters win in 1996, having been born on the Friday of that victory in Augusta, Georgia.
DORSET star Georgia Hall started by competing for Snickers bars at Canford Magna - now she has joined the most prestigious list of winners in golfing history.
Twenty-two years later, Hall is the pride of English golf just like Faldo was.
Hall was not at the top of her game, and was happy to remain only one shot behind.
"I made more mistakes than I did in the first two days", said Higa, who carded three birdies and two bogeys. To get six birdies on the final round of a major is not bad!
Hall, who receives a cheque of US$490,000, became the first English major victor since Karen Stupples won this event in 2004, and the fourth over all along with Laura Davies and Alison Nicholas.
Hall, who holed a string of great putts, had five birdies in a 69 to maintain high hopes of improving on last year's tie for third and become the first British victor since Scotland's Catriona Matthew triumphed at Lytham nine years ago.
Phatlum, the third-round leader, came out strong with four birdies over the first six holes.
And then he almost lost it.
Phatlum, who has never won in almost a decade on the LPGA Tour, will head into Sunday's final round at 13-under 203.
5 GEORGIA now splits her time between Bournemouth and her boyfriend Harry Tyrell's place in Surrey.
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Thomas bowed his head to collect his emotions, which were stronger than when he won the PGA Championship last summer.
Home favourite Georgia Hall shot a near-perfect five under par final round to claim the Women's British Open title. "I've never gotten like that on the golf course before".
"I told myself just to stay calm the whole way and not think about anything. So it was pretty cool to get it done".
Tiger Woods, an eight-time victor at Firestone, started 11 shots behind and figured he would go out with a bang by playing aggressively.
McIlroy finished the back nine with consecutive bogeys and never recovered.
Dustin Johnson, the world's No. 1 player who was coming off a victory in the Canadian Open last week, started the final round 10 shots behind and shot 29 on the front nine.
However, a bogey, just her second of the whole Championship, on the eighth after a drive into long grass saw Hall move back to just a stroke behind. Her playing partner, Sung Hyun Park, suffered throughout her final round. "But it is what it is, and on to next week".
After not qualifying for the ANA Inspiration, Hall made the cut in the following two majors and then finished a brilliant tied-third in the Women's British Open at Kingsbarns before earning another top-10 finish in the Evian Championship.
★ Georgia is only the third British victor since the event became a major in 2001.
BLAINE, Minn. - Kenny Perry created more drama than he wanted Sunday in the last 3M Championship.
"Winning this tournament has always been my goal for the year", Ryu said. "He's one of the greatest players of all time", Perry said.
Ahead of a tournament in Abu Dhabi previous year, Hall hit a drive of 579 yards on Yas Marina race track, believed to be the world's longest drive by a female golfer. I didn't want it any longer than that.
Canada's Brooke Henderson had a hole-in-one at the ninth - Florentyna Parker had an ace at the same hole in round one - and shot a 70 for five-under.